Steam-valve



(Model') W. MITCHELL.

STEAM VALVE.

,164. Patented June 16, 1885.

INVENTOR WITNESSES ATTORNEYS.

N. PETERS. Fhoiv-Lllhognphcr, Wiihinginn. D C.

.l'Niren grates STEAM -VALVE.

SPECIFICATION forming part of Letters Patent No. 320,154, dated June 16, 1885.

Application filed August 26, 1884.

To all whom it may concern:

Be it known that I, \VILLIAM MITCHELL, of Altoona, Blair county, Pennsylvania, have invented a new and Improved Steam-Valve, of which the following is a full, clear, and ex act description.

My invention consists in a vibrating cylindervalve constructed as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a section of the valve transversely of the axis. Fig. 2 is a cross-section on line x 00, Fig. 1. Fig. 3 is a side view of a double valve of the same construction.

The case of the valve, formed of the two half-boxes A A, forms part of or is attached to the plate 0, that may form partof an enginecylinder. In the base or plate are steam-ports a a and exhaust-port Z), and the top portion, A, of the valvecase has two inlet steamports, 0.

B is the valve,oi cylindrical form,contained in the case and provided with heads (Z, that overlap on the ends of the case,so as to pack the valve and prevent its endwise movement.

Transverse] y of the valve are two passages, e e, placed to coincide with the ports a 0 alternately with each other when the valve is rocked or vibrated, and valve B is also made with an exhaust-cavity, f.

Upon the heads (Z there are parallel flanges g g, forming transverse slide-ways for nuts h, which are carried by screws The screws are held at one end by lugs 70 on the heads, and are threaded right and left hand, so that when turned they move the nuts h to or from the axis of the valve. The nuts have studs on which rods Z are hung, and the rods of the corresponding nuts at each side of the valve are connected by bars,so as to form two yokes to which the operating-rods m are connected.

(Model) bration to the valve, thus bringing the passages e in the valve in line with ports a c in alternate order, and opening the exhaust to one port a at the same time. By adjusting the nuts h the movement of valve 13 is made longer or shorter.

The steam pressure is equalized on this valve so that it works with but little friction.

I11 Fig. 3 two valves of the same construction are linked together by rods Z, hung on nuts It, so that both valves will be simultaneously rocked. There is but one steam-port a in the case of each valve besides the exhaustpassage, and each valve has but one passage 6, the object being for one valve to supply steam to one end of the cylinder and the other valve to supply the other end.

The valve operating mechanism herein shown and described forms no part of the present invention; but I reserve to myself the right to make a separate application therefor at some future time.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The eombination,with the casing A A,provided with the steam-ports a and exhaust-port b in the bottom portion and with the inlet steam-ports c in the upper portion, ofthe cylindrical valve B, provided with the two passages e and the exhaust-cavityf, the said valve being of equal diameter throughout,and adapted to be rocked to cause its passages e to coincide alternately with the ports a c of the casing, substantially as herein shown and described.

In WVILLIAM X MITCHELL.

mark.

WVitnesses:

11?. N. MOORE, J AOOB SNYDER.

The rods m are to be operated to give vi- 

